参数资料
型号: C8051F300-TB
厂商: Silicon Laboratories Inc
文件页数: 176/178页
文件大小: 0K
描述: BOARD PROTOTYPING W/C8051F300
标准包装: 1
类型: MCU
适用于相关产品: C8051F300
所含物品:
Rev. 2.9
97
C8051F300/1/2/3/4/5
11. Oscillators
C8051F300/1/2/3/4/5 devices include a programmable internal oscillator and an external oscillator drive
circuit. The internal oscillator can be enabled/disabled and calibrated using the OSCICN and OSCICL reg-
isters, as shown in Figure 11.1. The system clock can be sourced by the external oscillator circuit, the
internal oscillator, or a scaled version of the internal oscillator. The internal oscillator's electrical specifica-
tions are given in Table 11.1 on page 99.
OSC
Programmable
Internal Clock
Generator
Input
Circuit
EN
SYSCLK
n
OSCICL
OSCICN
IFRDY
C
L
KSL
IOSC
EN
IFCN1
IFCN0
XTAL1
XTAL2
Option 2
VDD
XTAL2
Option 1
10M
Option 3
XTAL2
Option 4
XTAL2
OSCXCN
XT
LVLD
XO
SC
M
D
2
XO
SC
M
D
1
XO
SC
M
D
0
X
F
CN2
X
F
CN1
X
F
CN0
Figure 11.1. Oscillator Diagram
11.1. Programmable Internal Oscillator
All C8051F300/1/2/3/4/5 devices include a programmable internal oscillator that defaults as the system
clock after a system reset. The internal oscillator period can be adjusted via the OSCICL register as
defined by SFR Definition 11.1. On C8051F300/1 devices, OSCICL is factory calibrated to obtain a
24.5 MHz frequency. On C8051F302/3/4/5 devices, the oscillator frequency is a nominal 20 MHz and may
vary ±20% from device-to-device.
Electrical specifications for the precision internal oscillator are given in Table 11.1 on page 99. The pro-
grammed internal oscillator frequency must not exceed 25 MHz. Note that the system clock may be
derived from the programmed internal oscillator divided by 1, 2, 4, or 8, as defined by the IFCN bits in reg-
ister OSCICN. The divide value defaults to 8 following a reset.
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